Apple is struggling to cope with demand for 15-inch MacBook Pros equipped with new environment-friendly 's LED backlit displays.

The move to offer such displays in its laptops is part of the company's commitment to the environment. LCD displays contain small amounts of mercury, which LED displays do not.

Launching the new laptops in June, Apple's senior vice president of worldwide product marketing Phil Schiller said: “Apple’s notebooks have always led the industry in innovation with features like built-in 802.11 and the MagSafe Power Adapter, and now the industry’s first 15-inch LED-backlit display is another step toward completely eliminating mercury from our displays.”

But according to AppleInsider, Apple is facing problems meeting demand. The report observes Apple's estimated delivery times for the new Macs has slipped from 5-7 business days to 7-10 business days.

AppleInsider observes some Apple resellers complaining that they have extensive backorders of the new laptops which they have been unable to fulfil as stock has been in short - or no - supply.

"Some high-volume Apple dealers tell AppleInsider that thousand of units have remained on backorder since early June, while others claim they've yet to receive a single shipment of the new notebooks," the report explains.

Apple has said it will migrate all its screens to LED in future, though conceivably cost, availability, and production quantity of screens using the new technology will impact its road map for migrating to the technology across its product range.

Apple products with displays include its MacBook, MacBook Pro, iMac and Cinema Displays.